{"id":41609,"date":"2023-07-30T18:36:40","date_gmt":"2023-12-26T03:12:41","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%94%a8postgresql%e6%9e%84%e5%bb%bajson\/"},"modified":"2024-04-30T16:07:59","modified_gmt":"2024-04-30T08:07:59","slug":"%e7%94%a8postgresql%e6%9e%84%e5%bb%bajson","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%94%a8postgresql%e6%9e%84%e5%bb%bajson\/","title":{"rendered":"\u7528PostgreSQL\u6784\u5efaJSON."},"content":{"rendered":"

\u4e8b\u5148\u7b56\u5b9a<\/h2>\n

\u5728\u6211\u4e4b\u524d\u5199\u7684\u4e00\u7bc7\u540d\u4e3a”SQLQL”\u7684\u6587\u7ae0\u4e2d<\/p>\n

\u901a\u8fc7\u4f7f\u7528JSON_AGG\u51fd\u6570\uff0c\u53ef\u4ee5\u8fd4\u56de\u5d4c\u5957\u7ed3\u6784\u7684\u7ed3\u679c\u3002<\/p><\/blockquote>\n

\u56e0\u70ba\u53ea\u6709\u5beb\u4e0a\u300c\u53ea\u662f\u9019\u6a23\u300d\uff0c\u5b8c\u5168\u6c92\u6709\u89e3\u91cb\uff0c\u6240\u4ee5\u6211\u60f3\u8d81\u8457 PostgreSQL Advent Calendar \u7684\u6a5f\u6703\uff0c\u7a0d\u5fae\u5beb\u4e00\u4e9b\u8aaa\u660e\u3002<\/p>\n

\u9019\u500b\u6587\u7ae0\u4e2d\u6240\u89e3\u91cb\u7684\u51fd\u6578<\/h2>\n

\u5c06\u884c\u8f6c\u6362\u4e3aJSON<\/h3>\n
{<\/span>\"id\"<\/span>:<\/span>1<\/span>,<\/span>\"name\"<\/span>:<\/span>\"taro\"<\/span>}<\/span>\r\n<\/code><\/pre>\n
\u8fd4\u56de\u7c7b\u4f3c\u4e8eObject\u7684JSON\u7684\u51fd\u6570\u3002<\/p>\n
JSON_AGG\u7684\u4e2d\u6587\u7ffb\u8bd1\u4e3a\uff1a\u6c47\u603bJSON<\/h3>\n
[{<\/span>\"id\"<\/span>:<\/span>1<\/span>,<\/span>\"name\"<\/span>:<\/span>\"taro\"<\/span>},{<\/span>\"id\"<\/span>:<\/span>2<\/span>,<\/span>\"name\"<\/span>:<\/span>\"jiro\"<\/span>}]<\/span>\r\n<\/code><\/pre>\n
\u8fd4\u56de\u4e00\u4e2a\u7c7b\u4f3c\u4e8e\u6570\u7ec4\u7684 JSON \u7684\u51fd\u6570<\/p>\n
ROW_TO_JSON – \u5c06\u884c\u6570\u636e\u8f6c\u6362\u6210JSON\u683c\u5f0f<\/h2>\n
ROW\u6307\u7684\u662f\u4e2d\u56fd\u5357\u6d77\u7684\u4e00\u90e8\u5206\uff0c\u5305\u62ec\u4e86\u4e2d\u56fd\u5357\u6d77\u76849\u4e2a\u5c9b\u5c7f\u3002<\/h3>\n
ROW_TO_JSON \u306e ROW \u306f\u884c\u3068\u8a00\u3063\u3066\u3082\u3044\u3044\u3067\u3059\u304c\u3001\u5b9f\u614b\u3068\u3057\u3066\u306f\u30bf\u30d7\u30eb\uff08\u7d44\uff09\u306e\u4e8b\u3060\u3068\u601d\u3063\u3066\u3044\u3044\u3068\u601d\u3044\u307e\u3059
\n\u30de\u30cb\u30e5\u30a2\u30eb\u306b\u306f\u300c\u8907\u5408\u5024\u300d\u3068\u3044\u3046\u540d\u524d\u3067\u767b\u5834\u3057\u307e\u3059
\n\u4e0b\u306e\u3088\u3046\u306a\u5f0f\u3067\u751f\u6210\u3067\u304d\u307e\u3059<\/p>\n
SELECT<\/span> ROW<\/span>(<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>)<\/span>\r\n<\/code><\/pre>\n
    \n
  • \n
      \u5f0f\u306e\u4e2d\u306b2\u3064\u4ee5\u4e0a\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u3042\u308b\u5834\u5408\u306b\u306f\u3001ROW\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u5b9f\u969b\u306b\u306f\u7701\u7565\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \u30d5\u30a3\u30fc\u30eb\u30c9\u304c 1 \u3064\u3060\u3051\u3060\u3068\u3001\u5358\u4e00\u306e\u5024\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059<\/ul>\n
        SELECT<\/span> (<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>);<\/span> --> (1,2,3,4)<\/span>\r\nSELECT<\/span> (<\/span>1<\/span>);<\/span> --> 1<\/span>\r\nSELECT<\/span> ROW<\/span>(<\/span>1<\/span>);<\/span> --> (1)<\/span>\r\n<\/code><\/pre>\n
        ROW_TO_JSON \u7684\u7b80\u5355\u793a\u4f8b<\/h3>\n
          \u3053\u306e\u4f8b\u306e\u3088\u3046\u306b\u7121\u540d\u306e\u30bf\u30d7\u30eb\u3092 ROW_TO_JSON \u306b\u98df\u308f\u305b\u308b\u3068\u3001\u305d\u308c\u305e\u308c\u306e\u5024\u306b\u3064\u3044\u3066 f1, f2, f3, f4 \u306e\u3088\u3046\u306a\u9023\u756a\u306e\u540d\u524d\u304c\u81ea\u52d5\u7684\u306b\u4e0e\u3048\u3089\u308c\u305f Object \u306e JSON \u304c\u8fd4\u3063\u3066\u6765\u307e\u3059<\/ul>\n
          SELECT<\/span> ROW_TO_JSON<\/span>(<\/span>ROW<\/span>(<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>));<\/span>\r\n--           row_to_json<\/span>\r\n-- -------------------------------<\/span>\r\n--  {\"f1\":1,\"f2\":2,\"f3\":3,\"f4\":4}<\/span>\r\n-- (1 row)<\/span>\r\n<\/code><\/pre>\n
          \u7ed9\u4e88\u7c7b\u578b<\/h3>\n
          \u7c7b\u578b\u7684\u5b9a\u4e49<\/h4>\n
            PostgreSQL \u3067\u306f\u8907\u5408\u578b\u3068\u3044\u3046\u540d\u524d\u4ed8\u304d\u306e\u30bf\u30d7\u30eb\u3092\u8868\u3059\u578b\u3092\u5b9a\u7fa9\u3059\u308b\u4e8b\u304c\u3067\u304d\u307e\u3059<\/ul>\n
            CREATE<\/span> TYPE<\/span> hoge_numbers<\/span> as<\/span> (<\/span>\r\n            n1<\/span> integer<\/span>\r\n          ,<\/span> n2<\/span> integer<\/span>\r\n          ,<\/span> n3<\/span> integer<\/span>\r\n          ,<\/span> n4<\/span> integer<\/span>);<\/span>\r\n<\/code><\/pre>\n
              \u306a\u304a\u3001\u30c6\u30fc\u30d6\u30eb\u3092\u751f\u6210\u3059\u308b\u6642\u306b\u306f\u3001\u30c6\u30fc\u30d6\u30eb\u306e\u884c\u578b\u3092\u8868\u73fe\u3059\u308b\u305f\u3081\u306b\u3001\u30c6\u30fc\u30d6\u30eb\u540d\u3068\u540c\u3058\u540d\u524d\u306e\u8907\u5408\u578b\u3082\u81ea\u52d5\u7684\u306b\u751f\u6210\u3055\u308c\u307e\u3059<\/ul>\n
              CREATE<\/span> TABLE<\/span> hoge_numbers<\/span>(<\/span>\r\n             n1<\/span> integer<\/span>\r\n           ,<\/span> n2<\/span> integer<\/span>\r\n           ,<\/span> n3<\/span> integer<\/span>\r\n           ,<\/span> n4<\/span> integer<\/span>);<\/span>\r\n<\/code><\/pre>\n
              \u5411\u7279\u5b9a\u7684\u7c7b\u578b\u8f6c\u6362<\/h4>\n
                \n
              • \n
                  \u578b\u306e\u7d44\u307f\u5408\u308f\u305b\u304c\u5408\u3063\u3066\u3044\u308c\u3070\u3001(1,2,3,4)::hoge_numbers \u3068\u3044\u3063\u305f\u611f\u3058\u3067\u7121\u540d\u306e\u30bf\u30d7\u30eb\u3092\u540d\u524d\u4ed8\u304d\u306e\u578b\u3078\u3068\u30ad\u30e3\u30b9\u30c8\u3059\u308b\u4e8b\u304c\u3067\u304d\u307e\u3059<\/ul>\n<\/li>\n<\/ul>\n
                   <\/p>\n
                    \u540d\u524d\u4ed8\u304d\u306e\u578b\u306b\u30ad\u30e3\u30b9\u30c8\u3055\u308c\u305f\u30bf\u30d7\u30eb\u3092 ROW_TO_JSON \u306e\u5f15\u6570\u3068\u3057\u3066\u4e0e\u3048\u308b\u3068\u3001\u3061\u3083\u3093\u3068\u5404\u9805\u76ee\u306b\u610f\u56f3\u3057\u305f\u540d\u524d\u304c\u3064\u3044\u305f Object \u306e JSON \u304c\u8fd4\u3063\u3066\u6765\u307e\u3059<\/ul>\n
                     SELECT<\/span> ROW_TO_JSON<\/span>((<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>)::<\/span>hoge_numbers<\/span>);<\/span>\r\n--           row_to_json<\/span>\r\n-- -------------------------------<\/span>\r\n--  {\"n1\":1,\"n2\":2,\"n3\":3,\"n4\":4}<\/span>\r\n-- (1 row)<\/span>\r\n<\/code><\/pre>\n
                    JSON_AGG\u7684\u4e2d\u6587\u7ffb\u8bd1\uff1a\u5c06JSON\u5bf9\u8c61\u805a\u5408\u8d77\u6765<\/h2>\n
                    AGG \u7684\u610f\u601d\u662f\u4ec0\u4e48\uff1f<\/h3>\n
                      \n
                    • \n
                        AGG \u306f aggregate \u306e\u7565\u3060\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u8981\u3059\u308b\u306b SQL \u306b\u304a\u3051\u308b SUM() \u3068\u304b COUNT()\u306e\u4ef2\u9593\u3068\u8003\u3048\u3066\u5dee\u3057\u652f\u3048\u3042\u308a\u307e\u305b\u3093<\/ul>\n<\/li>\n<\/ul>\n
                         <\/p>\n
                          \u5358\u4f53\u3067\u3082\u4f7f\u3048\u307e\u3059\u304c\u3001SELECT \u3059\u308b\u4e2d\u3067\u3001\u4e00\u90e8\u306e\u5024\u306b\u3060\u3051\u9069\u7528\u3057\u305f\u3044\u5834\u5408\u306b\u306f GROUP BY \u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059<\/ul>\n
                          \u8bf7\u7ed9\u6211\u4e00\u4e2a\u4f8b\u5b50\u3002<\/h3>\n
                            \u3053\u306e\u4f8b\u3067\u306f WITH \u3067\u4f5c\u3063\u305f\u30a4\u30f3\u30e9\u30a4\u30f3\u306e “user” \u30c6\u30fc\u30d6\u30eb\u306e\u884c\u3092\u305d\u306e\u307e\u307e JSON_AGG() \u306e\u5f15\u6570\u306b\u5165\u308c\u308b\u4e8b\u3067\u3001\u5404\u884c\u306b ROW_TO_JSON() \u3092\u9069\u7528\u3057\u305f\u7d50\u679c\u3092 Array \u306b aggregate \u3057\u305f\u3088\u3046\u306a JSON \u304c\u8fd4\u3063\u3066\u6765\u307e\u3059<\/ul>\n
                              WITH<\/span> \"user\"<\/span>(<\/span>\"id\"<\/span>,<\/span> \"name\"<\/span>)<\/span> AS<\/span> (<\/span>\r\nVALUES<\/span> (<\/span>1<\/span>,<\/span> 'taro'<\/span>)<\/span>\r\n     ,<\/span> (<\/span>2<\/span>,<\/span> 'jiro'<\/span>))<\/span>\r\n\r\nSELECT<\/span> JSON_AGG<\/span>(<\/span>\"user\"<\/span>)<\/span>\r\n  FROM<\/span> \"user\"<\/span>;<\/span>\r\n\r\n--            json_agg<\/span>\r\n-- ---------------------------<\/span>\r\n--  [{\"id\":1,\"name\":\"taro\"}, +<\/span>\r\n--   {\"id\":2,\"name\":\"jiro\"}]<\/span>\r\n-- (1 row)<\/span>\r\n<\/code><\/pre>\n
                            \u5e94\u7528<\/h2>\n
                            ROW_TO_JSON() \u3068 JSON_AGG() \u3068\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3068\u3001\u8907\u96d1\u306b\u30cd\u30b9\u30c8\u3057\u305f\u69cb\u9020\u3092\u6301\u3064\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092 SQL \u3067\u4e00\u767a\u3067\u53d6\u5f97\u3059\u308b\u4e8b\u304c\u3067\u304d\u305f\u308a\u3057\u307e\u3059<\/p>\n
                            \u5c06\u4ee5\u4e0b\u5185\u5bb9\u7528\u4e2d\u6587\u8fdb\u884c\u540c\u4e49\u66ff\u6362\uff0c\u53ea\u9700\u8981\u63d0\u4f9b\u4e00\u79cd\u9009\u9879\uff1a
                            \n\u4f8b<\/h3>\n
                                WITH<\/span> \"user\"<\/span>(<\/span>\"id\"<\/span>,<\/span> \"name\"<\/span>)<\/span> AS<\/span> (<\/span>\r\n  VALUES<\/span> (<\/span>1<\/span>,<\/span> 'taro'<\/span>)<\/span>\r\n       ,<\/span> (<\/span>2<\/span>,<\/span> 'jiro'<\/span>)<\/span>\r\n       ,<\/span> (<\/span>3<\/span>,<\/span> 'sabu'<\/span>)<\/span>\r\n       ,<\/span> (<\/span>4<\/span>,<\/span> 'siro'<\/span>))<\/span>\r\n\r\n       ,<\/span> \"friendship\"<\/span>(<\/span>\"from\"<\/span>,<\/span> \"to\"<\/span>)<\/span> AS<\/span> (<\/span>\r\n  VALUES<\/span> (<\/span>1<\/span>,<\/span> 2<\/span>),<\/span> (<\/span>1<\/span>,<\/span> 3<\/span>),<\/span> (<\/span>1<\/span>,<\/span> 4<\/span>)<\/span>\r\n       ,<\/span> (<\/span>2<\/span>,<\/span> 3<\/span>)<\/span>\r\n       ,<\/span> (<\/span>3<\/span>,<\/span> 1<\/span>),<\/span> (<\/span>3<\/span>,<\/span> 2<\/span>),<\/span> (<\/span>3<\/span>,<\/span> 4<\/span>))<\/span>\r\n\r\n       ,<\/span> \"t\"<\/span> AS<\/span> (<\/span>\r\n  SELECT<\/span> \"me\"<\/span>.<\/span>\"id\"<\/span>\r\n       ,<\/span> \"me\"<\/span>.<\/span>\"name\"<\/span>\r\n       ,<\/span> ARRAY_AGG<\/span>(<\/span>\"friend\"<\/span>)<\/span> AS<\/span> friends<\/span>\r\n    FROM<\/span> \"user\"<\/span> AS<\/span> \"me\"<\/span>\r\n    JOIN<\/span> \"friendship\"<\/span> ON<\/span> \"me\"<\/span>.<\/span>\"id\"<\/span> =<\/span> \"from\"<\/span>\r\n    JOIN<\/span> \"user\"<\/span> AS<\/span> \"friend\"<\/span> ON<\/span> \"friend\"<\/span>.<\/span>\"id\"<\/span> =<\/span> \"to\"<\/span>\r\nGROUP<\/span> BY<\/span> 1<\/span>,<\/span> 2<\/span>)<\/span>\r\n\r\n  SELECT<\/span> JSON_AGG<\/span>(<\/span>\"t\"<\/span>)<\/span> AS<\/span> \"data\"<\/span>\r\n    FROM<\/span> \"t\"<\/span>\r\n;<\/span>\r\n-- data<\/span>\r\n-- --------------------------------------------------------------<\/span>\r\n-- [{\"id\":1,\"name\":\"taro\",\"friends\":[{\"id\":2,\"name\":\"jiro\"},   +<\/span>\r\n-- {\"id\":3,\"name\":\"sabu\"},                                    +<\/span>\r\n-- {\"id\":4,\"name\":\"siro\"}]},                                  +<\/span>\r\n-- {\"id\":2,\"name\":\"jiro\",\"friends\":[{\"id\":3,\"name\":\"sabu\"}]}, +<\/span>\r\n-- {\"id\":3,\"name\":\"sabu\",\"friends\":[{\"id\":1,\"name\":\"taro\"},   +<\/span>\r\n-- {\"id\":2,\"name\":\"jiro\"},                                    +<\/span>\r\n-- {\"id\":4,\"name\":\"siro\"}]}]<\/span>\r\n-- (1 row)<\/span>\r\n<\/code><\/pre>\n
                            [<\/span>\r\n  {<\/span>\r\n    \"id\"<\/span>:<\/span>1<\/span>,<\/span>\r\n    \"name\"<\/span>:<\/span>\"taro\"<\/span>,<\/span>\r\n    \"friends\"<\/span>:[<\/span>\r\n      {<\/span>\"id\"<\/span>:<\/span>2<\/span>,<\/span>\"name\"<\/span>:<\/span>\"jiro\"<\/span>},<\/span>\r\n      {<\/span>\"id\"<\/span>:<\/span>3<\/span>,<\/span>\"name\"<\/span>:<\/span>\"sabu\"<\/span>},<\/span>\r\n      {<\/span>\"id\"<\/span>:<\/span>4<\/span>,<\/span>\"name\"<\/span>:<\/span>\"siro\"<\/span>}<\/span>\r\n    ]<\/span>\r\n  },<\/span>\r\n  {<\/span>\r\n    \"id\"<\/span>:<\/span>2<\/span>,<\/span>\r\n    \"name\"<\/span>:<\/span>\"jiro\"<\/span>,<\/span>\r\n    \"friends\"<\/span>:[<\/span>\r\n      {<\/span>\"id\"<\/span>:<\/span>3<\/span>,<\/span>\"name\"<\/span>:<\/span>\"sabu\"<\/span>}<\/span>\r\n    ]<\/span>\r\n  },<\/span>\r\n  {<\/span>\r\n    \"id\"<\/span>:<\/span>3<\/span>,<\/span>\r\n    \"name\"<\/span>:<\/span>\"sabu\"<\/span>,<\/span>\r\n    \"friends\"<\/span>:[<\/span>\r\n      {<\/span>\"id\"<\/span>:<\/span>1<\/span>,<\/span>\"name\"<\/span>:<\/span>\"taro\"<\/span>},<\/span>\r\n      {<\/span>\"id\"<\/span>:<\/span>2<\/span>,<\/span>\"name\"<\/span>:<\/span>\"jiro\"<\/span>},<\/span>\r\n      {<\/span>\"id\"<\/span>:<\/span>4<\/span>,<\/span>\"name\"<\/span>:<\/span>\"siro\"<\/span>}<\/span>\r\n    ]<\/span>\r\n  }<\/span>\r\n]<\/span>\r\n<\/code><\/pre>\n
                            \u603b\u7ed3<\/h2>\n
                            \u6211\u4e0d\u592a\u6e05\u695a\uff0c\u4f46\u662f\u6709\u4e86\u8fd9\u79cd\u5de5\u5177\u4e4b\u540e\uff0c\u300c\u60f3\u7528 SQL \u505a\u4efb\u4f55\u4e8b\u60c5\u300d\u7684\u8303\u56f4\u4f1a\u6269\u5927\uff0c\u4f1a\u8ba9\u4eba\u611f\u5230\u56f0\u6270\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                            \u4e8b\u5148\u7b56\u5b9a \u5728\u6211\u4e4b\u524d\u5199\u7684\u4e00\u7bc7\u540d\u4e3a”SQLQL”\u7684\u6587\u7ae0\u4e2d \u901a\u8fc7\u4f7f\u7528JSON_AGG\u51fd\u6570\uff0c\u53ef […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-41609","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u7528PostgreSQL\u6784\u5efaJSON. - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u7528postgresql\u6784\u5efajson\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u7528PostgreSQL\u6784\u5efaJSON.\" \/>\n<meta property=\"og:description\" content=\"\u4e8b\u5148\u7b56\u5b9a \u5728\u6211\u4e4b\u524d\u5199\u7684\u4e00\u7bc7\u540d\u4e3a”SQLQL”\u7684\u6587\u7ae0\u4e2d \u901a\u8fc7\u4f7f\u7528JSON_AGG\u51fd\u6570\uff0c\u53ef […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u7528postgresql\u6784\u5efajson\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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